D8602: [platforms/drm] Restore previous mode if an atomic test fails

[David Edmundson]

davidedmundson accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R108 KWin

BRANCH
  drm-store-last-good-mode

REVISION DETAIL
  https://phabricator.kde.org/D8602

To: graesslin, #kwin, #plasma, subdiff, davidedmundson
Cc: davidedmundson, ngraham, plasma-devel, kwin, bwowk, ZrenBot, progwolff, lesliezhai, ali-mohamed, hardening, jensreuterberg, abetts, sebas, apol, mart
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